Currently, I am not sure how you manage to use the Easysocial Mailchimp custom field sync with your external marketing platform yet.

Or do you mean that you would like to export some of the user custom field data from Easysocial then import it to your external marketing platform?

If yes, I believe the Easysocial user export feature can export all the user custom field data to .csv format.

Hi,

i would like to add more custom fields in the ES mailchimp app to send more information other then name, email.

I see. Yes, currently we only pass in the user name and the email address to Mailchimp.

If you want to add a field send to Mailchimp when the user subscribes, then you need to modify this file JoomlaFolder/administrator/components/com_easysocial/includes/mailchimp/mailchimp.php (check my attached screenshot below)

And this is the file that passes in the user data to the subscribe function.
JoomlaFolder/media/com_easysocial/apps/fields/user/mailchimp/mailchimp.php

1. onRegisterAfterSave (will trigger this function during the registration process)
2. onEditAfterSaveFields (will trigger this function during user edit profile process)